Not pregnancy related but would like some advice.

Sarina💋 • I'm 25 • FTM • I gave birth 3 weeks early to an amazing little boy named Cameron • 10/6/15 • 7lbs 8oz • 20in
I just found out my 4 month old has a heart murmur. I'm taking him for a scan tomorrow. Has anyone else experienced this and is it common? Please comment below. Thanks.